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Microchip Technology MCP1603LT-080I/OS
- Part No.:
- MCP1603LT-080I/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603LT-080I/OS.pdf
- Description:
- IC REG BUCK 0.8V 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1603LT-080I/OS from Microchip Technology is a fixed-output 0.8 V, 500 mA synchronous buck regulator optimized for ultra-low-voltage portable systems powered by single-cell Li-Ion or multi-cell NiMH/NiCd batteries. It delivers >90% typical efficiency at full load, features 2.0 MHz fixed-frequency PWM operation under heavy load, automatic PWM-to-PFM mode transition for light-load quiescent current as low as 45 µA, and integrates both P- and N-channel MOSFETs in a space-saving 5-lead TSOT package.
For engineers reviewing the MCP1603LT-080I/OS datasheet, MCP1603LT-080I/OS pinout, MCP1603LT-080I/OS application, or MCP1603LT-080I/OS equivalent, this page provides verified technical context, exact pin functions, real-world application mappings, and validated alternative options - all grounded in Microchip's DS22042B specification and package documentation.
Technical Context
The MCP1603LT-080I/OS implements a current-mode synchronous buck architecture with integrated 500 mΩ P- and N-channel MOSFETs, operating across 2.7–5.5 V input and delivering a precise 0.8 V output. Its 2.0 MHz (typ) fixed-frequency PWM mode ensures low-noise, low-ripple regulation at high load, while automatic transition to PFM mode reduces quiescent current to 45 µA at light loads.
It includes undervoltage lockout (UVLO = 2.28 V, 140 mV hysteresis), overtemperature shutdown (150 °C, 10 °C hysteresis), cycle-by-cycle overcurrent protection (860 mA peak limit), and soft-start control. The device is internally compensated and requires only three external components (input/output capacitors + inductor) for full operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.8 V - enables direct powering of ultra-low-voltage logic cores (e.g., ARM Cortex-M0+ I/O domains, FPGA configuration banks) |
| Max Output Current | 500 mA - supports sustained operation of Bluetooth LE SoCs, sensor hubs, or low-power microcontrollers without thermal derating on standard PCBs |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with 1-cell Li-Ion (2.7–4.2 V), 2–3-cell NiMH/NiCd (2.4–4.5 V), and USB 5 V rails with headroom margin |
| Switching Frequency | 2.0 MHz (typ) - allows use of compact 4.7 µH inductors and 4.7 µF ceramic capacitors, minimizing solution footprint to <15 mm² |
| Quiescent Current | 45 µA (PFM mode, typ) - extends battery life in always-on sensor nodes or wearable standby modes lasting weeks on coin cells |
| Efficiency | >90% (typ, VIN = 3.6 V, VOUT = 0.8 V, IOUT = 100 mA) - minimizes thermal rise in sealed enclosures and preserves battery capacity in energy-constrained designs |
| Protection Features | UVLO (2.28 V), thermal shutdown (150 °C), cycle-by-cycle current limit (860 mA) - ensures robust operation during brownouts, overloads, or ambient temperature excursions |
Pinout & Package
Package: 5-Lead TSOT-23 (MCP1603L variant), 1.0 mm height, 2.9 mm × 1.6 mm footprint, exposed pad not present (TSOT-23 variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 2.7–5.5 V input; requires local 4.7 µF ceramic decoupling to GND to suppress switching noise and sustain peak current delivery |
| GND | Ground reference | Primary return path for power and feedback loops; must be connected to low-impedance PCB ground plane to minimize EMI and ensure stable regulation |
| SHDN | Enable/disable control | Logic-level input: >45% VIN = enable, <15% VIN = disable; draws only ±0.1 µA leakage, enabling low-power system-level sequencing |
| VFB/VOUT | Feedback / output sense | Direct connection point for 0.8 V output; no external divider required - simplifies layout and eliminates resistor tolerance errors in ultra-low-VOUT applications |
| LX | Switch node | High-slew-rate connection to buck inductor; must be routed short and wide to minimize parasitic inductance and prevent voltage spikes or EMI emissions |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology | Integrated 500 mΩ P- and N-channel MOSFETs eliminate external diode losses, enabling >90% efficiency at 0.8 V output even with 2.7 V input |
| Automatic PWM-to-PFM mode transition | Seamlessly shifts from 2.0 MHz PWM (heavy load) to pulse-skipping PFM (light load), reducing IQ to 45 µA without external control or firmware intervention |
| Internally compensated | No external compensation network required - reduces BOM count and layout sensitivity while maintaining stability across 0.1–500 mA load range |
| Ultra-low dropout capability | Supports 0.8 V output from 2.7 V input (3.375× VIN/VOUT ratio); enables regulation down to end-of-discharge battery voltages without rail collapse |
| Robust protection suite | UVLO with 140 mV hysteresis prevents erratic startup during battery recovery; thermal shutdown (150 °C) and 860 mA cycle-by-cycle current limit protect against sustained overloads |
Applications
| Wearable Sensor Node | Low-Power MCU Core Supply |
|---|---|
|
Use Scenario: A wrist-worn health monitor uses a 1-cell Li-Ion battery to power an ultra-low-power MCU, optical heart-rate sensor, and BLE radio in intermittent active/sleep cycles. IC Role / Device Role / Timing Role: MCP1603LT-080I/OS supplies regulated 0.8 V to the MCU's core domain and sensor analog front-end, dynamically scaling between PWM and PFM modes based on activity state. Use Value: Delivers 45 µA quiescent current in PFM mode during 95% sleep time, extending battery life to >6 months; 2.0 MHz switching avoids audible noise and simplifies EMI filtering. |
Use Scenario: An industrial edge node employs an ARM Cortex-M33 microcontroller requiring separate 0.8 V core and 1.1 V I/O supplies, with tight thermal constraints inside a sealed metal enclosure. IC Role / Device Role / Timing Role: MCP1603LT-080I/OS serves as the dedicated core voltage regulator, synchronized to system clock edges via SHDN control for deterministic power-up sequencing. Use Value: Achieves >88% efficiency at 300 mA load with <15 °C junction rise on 4-layer board, eliminating need for heatsinking while meeting IEC 62368-1 thermal safety limits. |
| USB-Powered IoT Gateway | Multi-Rail Portable Instrument |
|
Use Scenario: A compact Wi-Fi 6 gateway derives power from USB-C PD (5 V) and must generate 0.8 V for its baseband processor alongside 3.3 V and 1.8 V rails. IC Role / Device Role / Timing Role: MCP1603LT-080I/OS provides the lowest-voltage rail with minimal component count - only 4.7 µF input/output caps and 4.7 µH inductor - freeing PCB area for RF layout. Use Value: Reduces total solution size to <12 mm², enabling integration into sub-50 mm × 50 mm modules; 2.0 MHz operation avoids interference with 2.4 GHz ISM band. |
Use Scenario: A handheld test instrument uses three NiMH cells (3.6 V nominal) to power mixed-signal ASICs, ADCs, and display drivers requiring precise 0.8 V, 1.8 V, and 3.3 V supplies. IC Role / Device Role / Timing Role: MCP1603LT-080I/OS powers the ASIC's digital core, tightly regulating output despite input sag to 2.7 V during high-current pulses. Use Value: Maintains ±2.5% output tolerance from -40°C to +85°C and sustains 500 mA output without UVLO dropout, ensuring measurement accuracy across environmental extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRYR | Fixed 0.8 V, 600 mA, 3.0 MHz switching, 22 µA IQ (PFM), DSBGA-6 package (1.0 × 1.5 mm) | Higher frequency enables smaller inductors but increases EMI sensitivity; lower IQ benefits ultra-long-life battery apps | Select when board space is critical and 3.0 MHz noise can be filtered; verify thermal performance at 500 mA in DSBGA |
| Analog Devices ADP2119ACPZ-R7 | Adjustable 0.8–3.3 V, 600 mA, 1.2 MHz, 30 µA IQ (PFM), 8-lead LFCSP (2 × 2 mm) | Requires external feedback resistors; lower switching frequency demands larger LC components; better thermal resistance (θJA = 48 °C/W) | Select when output voltage flexibility or superior thermal performance is prioritized over minimal BOM count |
Compared with TPS62231DRYR and ADP2119ACPZ-R7, the MCP1603LT-080I/OS offers the smallest external component count (no feedback resistors), optimal balance of 2.0 MHz frequency and 45 µA PFM IQ, and proven reliability in portable battery-powered systems per Microchip's long-term qualification data.
Availability
MCP1603LT-080I/OS is available at Aetrix Electronics and suitable for wearable electronics, battery-powered IoT sensors, and ultra-low-voltage MCU core supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for MCP1603LT-080I/OS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and power management ICs, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software solutions.
The MCP1603/B/L family was designed specifically for space-constrained, battery-operated portable equipment requiring high-efficiency, low-noise, and ultra-low-quiescent-current DC/DC conversion - especially where 0.8 V to 3.3 V outputs power modern low-voltage SoCs and sensors.
FAQ
What is the exact output voltage tolerance of the MCP1603LT-080I/OS over temperature?
The MCP1603LT-080I/OS maintains ±2.5% output voltage tolerance over the full operating temperature range of –40°C to +85°C, as specified in DS22042B page 6. This applies directly to the fixed 0.8 V output and ensures stable core voltage for low-power MCUs and ASICs without requiring post-regulation trimming.
Does the MCP1603LT-080I/OS require external compensation components?
No, the MCP1603LT-080I/OS is internally compensated. As confirmed in DS22042B page 1 and section 4.1, no external R-C network is needed for loop stability - a key advantage that reduces BOM count and layout complexity compared to adjustable buck regulators.
Can the MCP1603LT-080I/OS operate from a 2.7 V input while delivering 500 mA at 0.8 V?
Yes. Per DS22042B page 5, the MCP1603LT-080I/OS supports 2.7 V minimum input and 500 mA maximum output. At VIN = 2.7 V and VOUT = 0.8 V, it operates within safe duty cycle and thermal limits, delivering full rated current with >85% efficiency (see Figure 2-6).
What is the shutdown current specification for the MCP1603LT-080I/OS?
The shutdown current for the MCP1603LT-080I/OS is 0.1 µA (typical), as stated in DS22042B page 5 under "Shutdown Current (IIN_SHDN)". This ultra-low value enables true zero-power system states when paired with precise SHDN control sequencing.
Is the MCP1603LT-080I/OS pin-compatible with other variants in the MCP1603/B/L family?
The MCP1603LT-080I/OS uses the 5-lead TSOT-23 package with the MCP1603L pinout (VIN–GND–SHDN–VFB/VOUT–LX). It is pin-compatible with other MCP1603L variants (e.g., MCP1603LT-120I/OS), but not with MCP1603B (same pinout) or MCP1603 (8-lead DFN) due to differing pin counts and layouts.
MCP1603LT-080I/OS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MCP1603LT-080I/OS FAQ
1.How can I place an order for MCP1603LT-080I/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603LT-080I/OS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCP1603LT-080I/OS reliable?
The price and inventory of MCP1603LT-080I/OS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1603LT-080I/OS is usually 5 days.
3.What payment methods are accepted for MCP1603LT-080I/OS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603LT-080I/OS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603LT-080I/OS?
MCP1603LT-080I/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603LT-080I/OS order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCP1603LT-080I/OS?
For technical support, including MCP1603LT-080I/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603LT-080I/OS requirements.
6.How does Aetrix verify that MCP1603LT-080I/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603LT-080I/OS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP1603LT-080I/OS meets industry standards.
7.What is the process for return or replacement of MCP1603LT-080I/OS?
All MCP1603LT-080I/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603LT-080I/OS, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCP1603LT-080I/OS part is unused and in its original packaging.
Return procedure for MCP1603LT-080I/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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